Adjustable screw-jack.



Patented-Aug. 2l, |900. J. C. F. LONG &'J. N. BISH.

ADJUSTABLE SCREW JACK.

(Application 'md su. e. 1900.)

(No IlndeL) sf/a.

/NVENTOS UNrTED 9 STATES PATENT OFFICE.

JOHN C pF. LONG AND JAMES N. BISI-I, OF ST. MARYS, OIIIO.

" ADJUSTABLE SCREW-JACK.

SPECIFICATION forming part of Letters Patent No. 656,464, dated August 21, 1900.

Application led January To @ZZ whom t may concern:

Beit knownthat we, JOHN C. F. LONG and JAMES N. BISH, citizens of the United States, residing at St. Marys, in the county of Auglaize and State of Ohio, have invented a new and Improved Adjustable Screw Jack, of which the following is a full, clear, and exact description. i

The invention relates to oil and `Artesian wells; and its object is to provide a new and improved adjustable screw jack, which is simple and durable in construction, very effective in operation,"and more especially designed for use in oil-wells, for conveniently raising or lowering sucker-rods, polish-rods, valves, and other attachments pertaining to a well outfit.

The invention consists of certain parts and details and combinations of the same, as will be fully described hereinafter and then pointed out in the claims.

A practical embodiment of our invention is represented in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure l is a sectional side elevation of the improvement as applied. Fig. 2 is a side elevation of thepimprovement, and Fig. isa cross-section of the same on the line 3 3 in Fig-2.

The improved jack is provided with a screwrod A, formed with a central bore A for the passage of a sucker-rod, polish-rod, or other device X to be raised or lowered, and on the lower end of said screw-rod is formed a head A2, from which extends an offset A3, having parallel sides for engagement with a pumping-jack, walking-beam, or other part Y used for pumping wells, as shown in Fig. 1. The

offset A3 serves mainly to hold the screw-rod in position and prevents it from turning when the device is used, as hereinafter more fully described. In the head A2 of the screw-rod A screw set-screws B, adapted to engage the part X, extending through the bore A,to temporarily7 secure said article to the screwrod for the purpose hereinafter mentioned.

On the screw-rod A screws a nut C, formedwith a barrel portion C,terminating in a head O2, formed with a bore C3 in alinement e, 190i). serai No; 614. ci@ maar `with the bore A', to permit the passage of `the part to be raised or lowered. On the head C2 is mounted to turn a swivel D, having in its head Da bore D? in screw alinement with the bores C3 and A', and in said head screw set-screws E for securing the part X teinporarily to the head of the swivel. Between the swivel D and the head C2 is interposed a ball-bearing F to allow convenient turning of the nut C, the latter being provided with a polygonal external portion C4 for the ap plication of a wrench or other tool used by the operator to turn the nut C on the iixed screw-rod A, the nut also having a handlel C5, adapted to be taken hold of by the operator for moving the device about and guidingit whenin use. y

In order to hold the swivel D from vertical displacement relatively to the head C2 of the nut C, the said head is formed with an extenL sion C5, passing loosely through an opening in the swivel, a nut Gr screwing on the end of said extension and resting against the inner bottom face of the swivel to prevent the lat-A ter from becoming accidentally displaced on the nut C, but at the same time permit a free turning of the nut relatively to the swivel.

In using the device it is passed over the rod to be raised or lowered, and then the operator screws up the set-screws E to temporarily fasten the device to the swivel D, and then the operator turns the nut C to screw the same outward on the screw-rod A and lift the swivel D with the device attached thereto. When the nut C has been screwed up to its full extent on the screw-rod A, then the operator screws up the set-screws B and loosens the set-screws E to hold the device temporarily in position in the screw-rod A, while the oper` ator turns the nut C in au opposite direction to screw it back on the screw-rod When this has been done, the set-screws E are again screwed inward to again fasten the device to the swivel D, and then the set-screws B are loosened and the nut C is turned to lift the swivel D with the device the second time, The abovedescribed operation is then repeated until the rod is lifted to the desired extent. In loweringthe screw-rod the device is vused in the same manner only in reverse order.

IOO

From the foregoing it is evident that the screw-jack can be readily applied and operated to raise or lower the desiredobject.

Having thus fully described our invention, we elainn as new and desire to secure by Letters Patent*- l. A screw-jack for oil and'ArtesianiW'ells, comprising a hollowserew-rod, a head on said screw-rod and having an offset thereon for holding the screw-rod from turning, a setsorew in said head, a nut screwing on said screw-rod, a swivel mounted to turn` on said n ut and provided with a head having a bore in alinernent with the bore in the head of the nut and that in the screw-rod, and a setserew in the swivelehead, substantially as shown and described.

2. A screw-jack for oil and A'rtesian wells, comprising a hollow screw-rod a head on said screw-rod and having an offset thereon for holding the screw-rod from turning, a setscrew in 'said head, a nut screwing on said screw-rod, a swivel mounted to turn on said nut and provided With a head having a bore in alinement with the bore in the head of the nnt and that in the screw-rod, a set-screw in the swivel-head, and means for holding the swivel against displacement on the head of the nut, as setforth.

JOHN C. F. LONG. JAMES N. BISH.

Witnesses:

ANTHONY CULHToN, C. L. SMITH. 

